\begin{pspicture}(0,-0.5)(10,7)
  \input{fig/1d-helpers.tex}
	% Repeated "diamond" structures.
	\psset{linecolor=lightgray,fillcolor=lightgray}
	\multiput(1,0)(2,0){4}{
		\multiput(0,1)(0,2){2}{%
			\Eup00\Eup20\Hup11
			\Eright00\Eright02\Hright11
			\Eleft20\Eleft22\Hleft11
		}
	}
	\psset{linecolor=black,fillcolor=black}
	% Darker, central diamond.
	\Hright44\Hleft64\Eup53  
	% "E" and "H" markers.
	\uput[r](5,5){$E$}\uput[r](6,4){$H$}  
  % Axes.
	\Taxis016 \Xaxis190
\end{pspicture}
